362 OVARIAN FOLLICLES IN FERRETS AND FERRET-POLECAT HYBRIDS. 
the expanded external ends of some of the follicle cells, the positions of the nuclei, and the structure of 
the cells. (Specimen F.D.A. 40/15. L.Z. 23 days post-partum in full heat.) I.H. 
Fig. 55. Section through a portion of the Avail of the ovarian follicle which contained the cumulus 
shown in fig. 53. x 310. The section shows a more advanced stage in the formation of the internal 
limiting membrane on the wall of the follicle than that seen on the cumulus, and a distinctly more advanced 
stage than that depicted in fig. 51. (Specimen F.D.A. 40/15. L.Z. 23 days post-partum in full heat.) I.H. 
Fig. 56. Section of a portion of the wall of a ripening ovarian follicle of a ferret killed 27J hours 
after insemination. x 310. The section shows the arrangement of the follicle cells in the immediate 
neighbourhood of the ovarian cumulus, and the relationship of the very definite internal limiting membrane to 
the follicle cells. (Specimen F.G. A. 1/15. R.Z. 2 7£ hours.) I.H. 
Fig. 57. Section of a portion of the wall of a fully-grown ovarian follicle of a ferret. x 1000. 
Showing the inclusion of degenerating follicular cells in the forming internal limiting membrane. (Specimen 
F.D.A. 40/15. L.Z. 23 days post-partum in full heat.) I.H. 
Plate X. 
Fig. 58. Section through a portion of the wall of a fully-grown normal ovarian follicle of a ferret, 
x 1000. Showing the structure of the cells and the relation of the external limiting membrane to the 
follicle cells and to the extra-follicular connective tissue. (Specimen F.Z.R. 1/14. Six days after unsuccess- 
fully attempted insemination in full heat.) I.H. 
Fig. 59. Section through a portion of the Avail of a fully-grown normal ovarian follicle of a ferret, 
x 1000. ShoAving strands of granules (mitochondria?) in the cells, the relation of the external ends of the 
cells to the external limiting membrane, and the- relation of the external limiting membrane to the wall of a 
blood-vessel. (Specimen F.D.A. 40/15. L,Z. 23 days post-partum in full heat.) I.H. 
Fig. 60. Section through a portion of the Avail of a fully-groAvn normal ovarian follicle of a ferret, 
x 1000. Showing the relation of the external limiting membrane to the outer ends of the follicle cells, to 
the extra-folliculal connective-tissue cells, and to the Avail of a blood-vessel. (Specimen F.D.A. 40/15. L.Z. 
23 days post-partum and in full heat.) ' I.H. 
Fig. 61. Section through the ovary of an anoestrus ferret. x 24. Showing the relation of the cortex 
to the medulla, the spindle strands of the cortex, and the ovarian follicles. (Specimen F.Z.R.A. 5/14.) I.H. 
Fig. 62. Section through a portion of the cortex of the ovary shown in fig, 61. x 340. Showing the 
superficial epithelium, the tunica albuginea, a young follicle, spindle-cell strands, and interstitial cells. 
(Specimen F.2, R.A. 5/14.) 
Fig. 63. Section of a portion of the cortex of the ovary of a ferret, x 340. Showing spindle- 
cell strands of the cortex, young follicles, and interstitial cells. Compare with fig. 3, which is a section of an 
adjacent portion of the same o\ r ary. (Specimen F.D. T/16. L.M.F. 123^ hours.) I.H. O.G. 
